| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2013 | 57.24 | 15 |
| 2012 | 56.46 | 16 |
| 2011 | 60.65 | 15 |
| 2010 | 61.25 | 15 |
| 2009 | 60.64 | 14 |
| 2008 | 61.95 | 15 |
| 2007 | 61.85 | 14 |
| 2006 | 63.78 | 9 |
| 2005 | 67.98 | 8 |
| 2004 | 72.99 | 9 |
| 2003 | 70.61 | 8 |
| 2002 | 69.86 | 6 |
| 2001 | 71.58 | 6 |
| 2000 | 69.13 | 6 |
| 1999 | 79.82 | 3 |
| 1998 | 82.23 | 2 |
| 1997 | 83.73 | 2 |
| 1996 | 82.36 | 3 |
| 1995 | 85.98 | 2 |
| 1994 | 89.31 | 1 |
| 1993 | 94.39 | 1 |
| 1992 | 91.54 | 1 |
| 1991 | 88.39 | 1 |
| 1990 | 90.76 | 1 |
| 1989 | 80.76 | 1 |
| 1988 | 79.43 | 2 |
| 1987 | 83.58 | 2 |
| 1986 | 87.94 | 2 |